Swordfish

The swordfish is a large, fast-swimming predatory fish found in temperate and tropical oceans worldwide, named for its long, flat, sword-like bill formed from an extension of the upper jaw, used to slash through schools of prey fish and squid before circling back to consume the injured or stunned victims. It is among the fastest fish in the ocean, with a streamlined, scaleless body as an adult and a highly efficient circulatory adaptation that keeps its eyes and brain warmer than the surrounding water, sharpening its vision during deep, cold dives in pursuit of prey. Swordfish are solitary, highly migratory fish that can dive to great depths during the day and rise closer to the surface at night, and they are a major target of commercial and recreational fisheries worldwide, with some regional stocks subject to careful management following historical overfishing concerns.